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下图左侧表示健康人体内甲状腺激素的分泌调节，右侧表示Graves氏病的致病机理，该病是由于机体产生一种抗体，它可与B激素受体结合，从而发挥与B激素相同的生理作用，但甲状腺激素不会影响该抗体的分泌。请回答： 图中的激素A能促进激素B的分泌，进而促进甲状腺激素分泌；当甲状腺激素达到较高水平时，又会造成有关腺体分泌的（）（填图中字母）减少，进而使甲状腺激素的分泌减少。这两个过程反映了健康人体内甲状腺激素的分泌存在（）调节，也存在着（）调节。
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